A sheeter for feeding sheets in shingled relation to a point of collection including a source of sheets, a first conveyor belt and a second conveyor belt operating at substantially reduced speed so that the sheets are collected thereon in shingled relation. For snubbing the successive sheets so that they are decelerated and uniformly spaced on the second conveyor belt, a snubber is provided in the form of a knock-down roller arm rotating in a vertical plane at the upstream end of the second conveyor belt and so spaced therefrom as to press a sheet into engagement with the second conveyor belt, the arm being driven at a rotary speed which is synchronized with the source, with means being provided for adjusting the phase of the arm with respect to the source so that the arm engages the tail of each successive sheet. In the preferred form of the invention the conveyor belts are separated to form a gap occupied by a diverter, and a high speed nip is provided at the downstream end of the gap so that a sheet traverses the gap and is fed into the nip without changing its speed. For squaring up each sheet passing through the high-speed nip, a pair of squaring and press down rollers are provided at the downstream end of the second conveyor belt with means for adjusting the longitudinal position of the rollers so that they are engaged by the leading edge of the sheet just prior to engagement of the tail of the sheet by the knock-down arm thus insuring precise shingling and freedom from buckling of individual sheets. Infinetely variable cutoff is provided.